Ignition distributor radio interference eliminator



Sept- 10, 1935- R. .1. DUTTERER 2,014,618

IGNITION DISTRIBUTOR RADIO INTERFERENCE ELIMINATOR Filed Oct. 9, 19155K61 (fl. fiattgr j BY WW 4% ATTORNEY? Patented Sept. 10, 1935 UNITEDSTATES PATENT OFFICE Rex J. L. Dutterer, Toledo, Ohio, assignor toDefiance Spark Plugs, Inc., Toledo, Ohio, a corporation of OhioApplication October 9, 1933, Serial No. 692,913 1 Claim. (01. 123-148)The invention relates to radio interference eliminators of that typeparticularly designed for use on motor cars and in the ignition circuitsthereof. It is the object of the invention to ef- 5 fectively suppressradio interference in all of the ignition circuits'of a multi-cylinderinternal combustion engine, and to this end the invention consists,first, in the location of the suppressor resistor in the rotor of theignition distributor so as to be included in the ignition circuit toeach of the spark plugs; second, in the specific construction ashereinafter set forth.

In the drawing:

Fig. 1 is a longitudinal section through a portion of an ignitiondistributor showing my improvements applied thereto;

Fig. 2 is a section on line 2--2 of Fig. 1.

In the present state of .the art, radio interference eliminators havebeen used in ignition circuits of motor vehicles and have been variouslylocated. It is usual to place suppressors adjacent to each of the sparkplugs and also to locate one at the distributor, which latter isgenerally placed in the distributor cap or in the high tension wire asnear the distributor as possible. With my improved construction I haveplaced a distributor suppressor in the rotor element of the distributorwhere it is well protected and does not interfere with the functioningof any other part. It is also advantageous to place the suppressor asclose as possible to the source of trouble which is accomplished in thislocation.

As illustrated in the drawing, A is the casing of the distributor, B isthe rotary shaft therein and C is the rotor mounted on the shaft Bformed of insulating material. It is usual with such rotors to mount ametallic plate on the insulator body to extend radially thereof, itsouter end forming the distributor contact and its inner end receivingthe high tension current from the common conductor therefor. Thisconstruction I have changed by placing two separate plates on theinsulator body one plate D forming the dis- 5 tributor contact 'and thesecond plate E receiving the currei'zt', from the common conductor Fthrough the usual contact brush G. The plates D and E are sufflcientlyseparated from each other to prevent jumping of spark from one to theother 10 and a suppressor resistor H extends betweenthese plates and iselectrically connected thereto; Preferably this resistor is located inthe groove in the insulator head C beneath the plates D and E, beingconnected to the latter by soldering or'l5 in any suitable way. Thesuppressor may be made of any suitable material, such as carbon, siliconcarbide or a wire wound coil.

With the construction as described the suppressor unit is placed in therotor during manu- 20 facture of the same and therefore is always inoperative relation to the circuits when the distributor is assembled. Itis exceedingly simple in construction, requiring no extra part otherthan the resistor.

What I claim as my invention is:

The combination with an ignition distributor, of a rotor thereforcomprising an insulator body, spaced plates mounted on said body, oneforming the distributor contact and the other the contact 30 forreceiving the current from the common conductor, and a resistor formingthe suppressor unit located in a groove in said insulator body directlybeneath said plates and having the opposite end portions overlapping theplates in engagement therewith to establish an electrical connectiontherebetween.

REX J. L. DU'I'I'ERER.

